The Aqua Dumbbells from BECO are a water resistance training tool that can be used as part of an aqua aerobics workout in the pool for an upper body workout. Use these lightweight dumbbells to push and pull through the water to increase your coordination, balance, strength, and flexibility. Purpose: To create buoyancy and water resistance that pushes against you, making you work harder to move your arms in the water, which will increase your upper body strength.Shoulders: Raise the dumbbells with your arms stretched out at the sides of your body to work your shoulder muscles.Pectoral muscles: Bring the dumbbells together in front of your body to work your pecs Tips: Any exercises that you do in the gym with free weights, you can do in the water with these aqua dumbbells with little chance of being injured. Wear an aqua belt and use the dumbbells whilst you are water jogging for an all over workout. Features: Super quality laminated PE foam Soft padded handles complete with loop handle Gym alternative resistance free weights  Dimensions:Small - 29 cm Length x 9 cm Diameter / 94g eachMedium - 22 cm Length x 14.5 cm Diameter / 116g eachLarge - 26.5 cm Length x 15 cm Diameter / 154g each